What do you call a trading expedition to the country of the Celts when you don't actually have anything to trade? Well... maybe a trip? Why shouldn't it be possible for a well-armed group of Vikings to "trade" with a village or two over there?
So why not take the opportunity when you can get a ship?
The scenario is distributed as a 12-page document with a separate 6-page (print-and-play) character document